提交 99231028 编写于 作者: J Jason Wessel 提交者: Dave Airlie

kdb, kms: Save and restore the LUT on atomic KMS enter/exit

When changing VTs non-atomically the kernel works in conjunction with
the Xserver in user space and receives the LUT information from the
Xserver via a system call.  When changing modes atomically for kdb,
this information must be saved and restored without disturbing user
space as if nothing ever happened.

There is a short cut used by this patch where gamma_store is used as
the save space.  If this turns out to be a problem in the future a
pre-allocated chunk of memory will be required for each crtc to save
and restore the LUT information.
Signed-off-by: NJason Wessel <jason.wessel@windriver.com>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: David Airlie <airlied@linux.ie>
CC: dri-devel@lists.freedesktop.org
Signed-off-by: NDave Airlie <airlied@redhat.com>
上级 38ed0fca
...@@ -242,6 +242,30 @@ static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper) ...@@ -242,6 +242,30 @@ static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
return 0; return 0;
} }
static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
{
uint16_t *r_base, *g_base, *b_base;
int i;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
for (i = 0; i < crtc->gamma_size; i++)
helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
}
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
}
int drm_fb_helper_debug_enter(struct fb_info *info) int drm_fb_helper_debug_enter(struct fb_info *info)
{ {
struct drm_fb_helper *helper = info->par; struct drm_fb_helper *helper = info->par;
...@@ -260,6 +284,7 @@ int drm_fb_helper_debug_enter(struct fb_info *info) ...@@ -260,6 +284,7 @@ int drm_fb_helper_debug_enter(struct fb_info *info)
continue; continue;
funcs = mode_set->crtc->helper_private; funcs = mode_set->crtc->helper_private;
drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
funcs->mode_set_base_atomic(mode_set->crtc, funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb, mode_set->fb,
mode_set->x, mode_set->x,
...@@ -309,6 +334,7 @@ int drm_fb_helper_debug_leave(struct fb_info *info) ...@@ -309,6 +334,7 @@ int drm_fb_helper_debug_leave(struct fb_info *info)
continue; continue;
} }
drm_fb_helper_restore_lut_atomic(mode_set->crtc);
funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
crtc->y, 0); crtc->y, 0);
} }
......
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